[deliverable/linux.git] / arch / powerpc / platforms / cell / interrupt.c

/*
 * Cell Internal Interrupt Controller
 *
 * Copyright (C) 2006 Benjamin Herrenschmidt (benh@kernel.crashing.org)
 *                    IBM, Corp.
 *
 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
 *
 * Author: Arnd Bergmann <arndb@de.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/percpu.h>
#include <linux/types.h>
#include <linux/ioport.h>

#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/prom.h>
#include <asm/ptrace.h>
#include <asm/machdep.h>

#include "interrupt.h"
#include "cbe_regs.h"

struct iic {
	struct cbe_iic_thread_regs __iomem *regs;
	u8 target_id;
	u8 eoi_stack[16];
	int eoi_ptr;
	struct irq_host *host;
};

static DEFINE_PER_CPU(struct iic, iic);
#define IIC_NODE_COUNT	2
static struct irq_host *iic_hosts[IIC_NODE_COUNT];

/* Convert between "pending" bits and hw irq number */
static irq_hw_number_t iic_pending_to_hwnum(struct cbe_iic_pending_bits bits)
{
	unsigned char unit = bits.source & 0xf;

	if (bits.flags & CBE_IIC_IRQ_IPI)
		return IIC_IRQ_IPI0 | (bits.prio >> 4);
	else if (bits.class <= 3)
		return (bits.class << 4) | unit;
	else
		return IIC_IRQ_INVALID;
}

static void iic_mask(unsigned int irq)
{
}

static void iic_unmask(unsigned int irq)
{
}

static void iic_eoi(unsigned int irq)
{
	struct iic *iic = &__get_cpu_var(iic);
	out_be64(&iic->regs->prio, iic->eoi_stack[--iic->eoi_ptr]);
	BUG_ON(iic->eoi_ptr < 0);
}

static struct irq_chip iic_chip = {
	.typename = " CELL-IIC ",
	.mask = iic_mask,
	.unmask = iic_unmask,
	.eoi = iic_eoi,
};

/* Get an IRQ number from the pending state register of the IIC */
static unsigned int iic_get_irq(struct pt_regs *regs)
{
  	struct cbe_iic_pending_bits pending;
 	struct iic *iic;

 	iic = &__get_cpu_var(iic);
 	*(unsigned long *) &pending =
 		in_be64((unsigned long __iomem *) &iic->regs->pending_destr);
 	iic->eoi_stack[++iic->eoi_ptr] = pending.prio;
 	BUG_ON(iic->eoi_ptr > 15);
	if (pending.flags & CBE_IIC_IRQ_VALID)
		return irq_linear_revmap(iic->host,
 					 iic_pending_to_hwnum(pending));
	return NO_IRQ;
}

#ifdef CONFIG_SMP

/* Use the highest interrupt priorities for IPI */
static inline int iic_ipi_to_irq(int ipi)
{
	return IIC_IRQ_IPI0 + IIC_NUM_IPIS - 1 - ipi;
}

static inline int iic_irq_to_ipi(int irq)
{
	return IIC_NUM_IPIS - 1 - (irq - IIC_IRQ_IPI0);
}

void iic_setup_cpu(void)
{
	out_be64(&__get_cpu_var(iic).regs->prio, 0xff);
}

void iic_cause_IPI(int cpu, int mesg)
{
	out_be64(&per_cpu(iic, cpu).regs->generate, (IIC_NUM_IPIS - 1 - mesg) << 4);
}

u8 iic_get_target_id(int cpu)
{
	return per_cpu(iic, cpu).target_id;
}
EXPORT_SYMBOL_GPL(iic_get_target_id);

struct irq_host *iic_get_irq_host(int node)
{
	if (node < 0 || node >= IIC_NODE_COUNT)
		return NULL;
	return iic_hosts[node];
}
EXPORT_SYMBOL_GPL(iic_get_irq_host);


static irqreturn_t iic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
{
	int ipi = (int)(long)dev_id;

	smp_message_recv(ipi, regs);

	return IRQ_HANDLED;
}

static void iic_request_ipi(int ipi, const char *name)
{
	int node, virq;

	for (node = 0; node < IIC_NODE_COUNT; node++) {
		char *rname;
		if (iic_hosts[node] == NULL)
			continue;
		virq = irq_create_mapping(iic_hosts[node],
					  iic_ipi_to_irq(ipi));
		if (virq == NO_IRQ) {
			printk(KERN_ERR
			       "iic: failed to map IPI %s on node %d\n",
			       name, node);
			continue;
		}
		rname = kzalloc(strlen(name) + 16, GFP_KERNEL);
		if (rname)
			sprintf(rname, "%s node %d", name, node);
		else
			rname = (char *)name;
		if (request_irq(virq, iic_ipi_action, IRQF_DISABLED,
				rname, (void *)(long)ipi))
			printk(KERN_ERR
			       "iic: failed to request IPI %s on node %d\n",
			       name, node);
	}
}

void iic_request_IPIs(void)
{
	iic_request_ipi(PPC_MSG_CALL_FUNCTION, "IPI-call");
	iic_request_ipi(PPC_MSG_RESCHEDULE, "IPI-resched");
#ifdef CONFIG_DEBUGGER
	iic_request_ipi(PPC_MSG_DEBUGGER_BREAK, "IPI-debug");
#endif /* CONFIG_DEBUGGER */
}

#endif /* CONFIG_SMP */


static int iic_host_match(struct irq_host *h, struct device_node *node)
{
	return h->host_data != NULL && node == h->host_data;
}

static int iic_host_map(struct irq_host *h, unsigned int virq,
			irq_hw_number_t hw)
{
	if (hw < IIC_IRQ_IPI0)
		set_irq_chip_and_handler(virq, &iic_chip, handle_fasteoi_irq);
	else
		set_irq_chip_and_handler(virq, &iic_chip, handle_percpu_irq);
	return 0;
}

static int iic_host_xlate(struct irq_host *h, struct device_node *ct,
			   u32 *intspec, unsigned int intsize,
			   irq_hw_number_t *out_hwirq, unsigned int *out_flags)

{
	/* Currently, we don't translate anything. That needs to be fixed as
	 * we get better defined device-trees. iic interrupts have to be
	 * explicitely mapped by whoever needs them
	 */
	return -ENODEV;
}

static struct irq_host_ops iic_host_ops = {
	.match = iic_host_match,
	.map = iic_host_map,
	.xlate = iic_host_xlate,
};

static void __init init_one_iic(unsigned int hw_cpu, unsigned long addr,
				struct irq_host *host)
{
	/* XXX FIXME: should locate the linux CPU number from the HW cpu
	 * number properly. We are lucky for now
	 */
	struct iic *iic = &per_cpu(iic, hw_cpu);

	iic->regs = ioremap(addr, sizeof(struct cbe_iic_thread_regs));
	BUG_ON(iic->regs == NULL);

	iic->target_id = ((hw_cpu & 2) << 3) | ((hw_cpu & 1) ? 0xf : 0xe);
	iic->eoi_stack[0] = 0xff;
	iic->host = host;
	out_be64(&iic->regs->prio, 0);

	printk(KERN_INFO "IIC for CPU %d at %lx mapped to %p, target id 0x%x\n",
	       hw_cpu, addr, iic->regs, iic->target_id);
}

static int __init setup_iic(void)
{
	struct device_node *dn;
	struct resource r0, r1;
	struct irq_host *host;
	int found = 0;
 	const u32 *np;

	for (dn = NULL;
	     (dn = of_find_node_by_name(dn,"interrupt-controller")) != NULL;) {
		if (!device_is_compatible(dn,
				     "IBM,CBEA-Internal-Interrupt-Controller"))
			continue;
		np = get_property(dn, "ibm,interrupt-server-ranges", NULL);
 		if (np == NULL) {
			printk(KERN_WARNING "IIC: CPU association not found\n");
			of_node_put(dn);
			return -ENODEV;
		}
		if (of_address_to_resource(dn, 0, &r0) ||
		    of_address_to_resource(dn, 1, &r1)) {
			printk(KERN_WARNING "IIC: Can't resolve addresses\n");
			of_node_put(dn);
			return -ENODEV;
		}
		host = NULL;
		if (found < IIC_NODE_COUNT) {
			host = irq_alloc_host(IRQ_HOST_MAP_LINEAR,
					      IIC_SOURCE_COUNT,
					      &iic_host_ops,
					      IIC_IRQ_INVALID);
			iic_hosts[found] = host;
			BUG_ON(iic_hosts[found] == NULL);
			iic_hosts[found]->host_data = of_node_get(dn);
			found++;
		}
		init_one_iic(np[0], r0.start, host);
		init_one_iic(np[1], r1.start, host);
	}

	if (found)
		return 0;
	else
		return -ENODEV;
}

void __init iic_init_IRQ(void)
{
	/* Discover and initialize iics */
	if (setup_iic() < 0)
		panic("IIC: Failed to initialize !\n");

	/* Set master interrupt handling function */
	ppc_md.get_irq = iic_get_irq;

	/* Enable on current CPU */
	iic_setup_cpu();
}
Commit	Line	Data
cebf589c	1	/*
f3f66f59	2	* Cell Internal Interrupt Controller
cebf589c	3	*
0ebfff14 BH	4	* Copyright (C) 2006 Benjamin Herrenschmidt (benh@kernel.crashing.org)
	5	* IBM, Corp.
	6	*
cebf589c AB	7	* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
	8	*
	9	* Author: Arnd Bergmann <arndb@de.ibm.com>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2, or (at your option)
	14	* any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*/
	25
cebf589c AB	26	#include <linux/interrupt.h>
cebf589c AB	27	#include <linux/irq.h>
2fb9d206	28	#include <linux/module.h>
cebf589c AB	29	#include <linux/percpu.h>
cebf589c AB	30	#include <linux/types.h>
0ebfff14	31	#include <linux/ioport.h>
cebf589c AB	32
	33	#include <asm/io.h>
	34	#include <asm/pgtable.h>
	35	#include <asm/prom.h>
	36	#include <asm/ptrace.h>
0ebfff14	37	#include <asm/machdep.h>
cebf589c	38
f3f66f59	39	#include "interrupt.h"
acf7d768	40	#include "cbe_regs.h"
cebf589c AB	41
cebf589c AB	42	struct iic {
acf7d768	43	struct cbe_iic_thread_regs __iomem *regs;
2fb9d206	44	u8 target_id;
b9e5b4e6 BH	45	u8 eoi_stack[16];
b9e5b4e6 BH	46	int eoi_ptr;
0ebfff14	47	struct irq_host *host;
cebf589c AB	48	};
	49
	50	static DEFINE_PER_CPU(struct iic, iic);
0ebfff14 BH	51	#define IIC_NODE_COUNT 2
	52	static struct irq_host *iic_hosts[IIC_NODE_COUNT];
	53
	54	/* Convert between "pending" bits and hw irq number */
	55	static irq_hw_number_t iic_pending_to_hwnum(struct cbe_iic_pending_bits bits)
	56	{
	57	unsigned char unit = bits.source & 0xf;
	58
	59	if (bits.flags & CBE_IIC_IRQ_IPI)
	60	return IIC_IRQ_IPI0 \| (bits.prio >> 4);
	61	else if (bits.class <= 3)
	62	return (bits.class << 4) \| unit;
	63	else
	64	return IIC_IRQ_INVALID;
	65	}
cebf589c	66
b9e5b4e6	67	static void iic_mask(unsigned int irq)
cebf589c	68	{
cebf589c AB	69	}
cebf589c AB	70
b9e5b4e6	71	static void iic_unmask(unsigned int irq)
cebf589c AB	72	{
	73	}
	74
b9e5b4e6	75	static void iic_eoi(unsigned int irq)
cebf589c	76	{
b9e5b4e6 BH	77	struct iic *iic = &__get_cpu_var(iic);
	78	out_be64(&iic->regs->prio, iic->eoi_stack[--iic->eoi_ptr]);
	79	BUG_ON(iic->eoi_ptr < 0);
cebf589c AB	80	}
cebf589c AB	81
b9e5b4e6	82	static struct irq_chip iic_chip = {
f3f66f59	83	.typename = " CELL-IIC ",
b9e5b4e6 BH	84	.mask = iic_mask,
	85	.unmask = iic_unmask,
	86	.eoi = iic_eoi,
cebf589c AB	87	};
cebf589c AB	88
cebf589c	89	/* Get an IRQ number from the pending state register of the IIC */
0ebfff14	90	static unsigned int iic_get_irq(struct pt_regs *regs)
d0e57c68	91	{
0ebfff14 BH	92	struct cbe_iic_pending_bits pending;
	93	struct iic *iic;
	94
	95	iic = &__get_cpu_var(iic);
	96	(unsigned long ) &pending =
	97	in_be64((unsigned long __iomem *) &iic->regs->pending_destr);
	98	iic->eoi_stack[++iic->eoi_ptr] = pending.prio;
	99	BUG_ON(iic->eoi_ptr > 15);
	100	if (pending.flags & CBE_IIC_IRQ_VALID)
	101	return irq_linear_revmap(iic->host,
	102	iic_pending_to_hwnum(pending));
	103	return NO_IRQ;
cebf589c AB	104	}
	105
	106	#ifdef CONFIG_SMP
a84195f3 AB	107
	108	/* Use the highest interrupt priorities for IPI */
	109	static inline int iic_ipi_to_irq(int ipi)
	110	{
0ebfff14	111	return IIC_IRQ_IPI0 + IIC_NUM_IPIS - 1 - ipi;
a84195f3 AB	112	}
	113
	114	static inline int iic_irq_to_ipi(int irq)
	115	{
0ebfff14	116	return IIC_NUM_IPIS - 1 - (irq - IIC_IRQ_IPI0);
a84195f3 AB	117	}
a84195f3 AB	118
cebf589c AB	119	void iic_setup_cpu(void)
	120	{
	121	out_be64(&__get_cpu_var(iic).regs->prio, 0xff);
	122	}
	123
	124	void iic_cause_IPI(int cpu, int mesg)
	125	{
a84195f3	126	out_be64(&per_cpu(iic, cpu).regs->generate, (IIC_NUM_IPIS - 1 - mesg) << 4);
cebf589c AB	127	}
cebf589c AB	128
2fb9d206 AB	129	u8 iic_get_target_id(int cpu)
	130	{
	131	return per_cpu(iic, cpu).target_id;
	132	}
	133	EXPORT_SYMBOL_GPL(iic_get_target_id);
	134
0ebfff14 BH	135	struct irq_host *iic_get_irq_host(int node)
	136	{
	137	if (node < 0 \|\| node >= IIC_NODE_COUNT)
	138	return NULL;
	139	return iic_hosts[node];
	140	}
	141	EXPORT_SYMBOL_GPL(iic_get_irq_host);
	142
	143
cebf589c AB	144	static irqreturn_t iic_ipi_action(int irq, void dev_id, struct pt_regs regs)
cebf589c AB	145	{
0ebfff14 BH	146	int ipi = (int)(long)dev_id;
	147
	148	smp_message_recv(ipi, regs);
	149
cebf589c AB	150	return IRQ_HANDLED;
	151	}
	152
a84195f3	153	static void iic_request_ipi(int ipi, const char *name)
cebf589c	154	{
0ebfff14	155	int node, virq;
a84195f3	156
0ebfff14 BH	157	for (node = 0; node < IIC_NODE_COUNT; node++) {
	158	char *rname;
	159	if (iic_hosts[node] == NULL)
	160	continue;
	161	virq = irq_create_mapping(iic_hosts[node],
6e99e458	162	iic_ipi_to_irq(ipi));
0ebfff14 BH	163	if (virq == NO_IRQ) {
	164	printk(KERN_ERR
	165	"iic: failed to map IPI %s on node %d\n",
	166	name, node);
	167	continue;
	168	}
	169	rname = kzalloc(strlen(name) + 16, GFP_KERNEL);
	170	if (rname)
	171	sprintf(rname, "%s node %d", name, node);
	172	else
	173	rname = (char *)name;
	174	if (request_irq(virq, iic_ipi_action, IRQF_DISABLED,
	175	rname, (void *)(long)ipi))
	176	printk(KERN_ERR
	177	"iic: failed to request IPI %s on node %d\n",
	178	name, node);
	179	}
cebf589c AB	180	}
	181
	182	void iic_request_IPIs(void)
	183	{
a84195f3 AB	184	iic_request_ipi(PPC_MSG_CALL_FUNCTION, "IPI-call");
a84195f3 AB	185	iic_request_ipi(PPC_MSG_RESCHEDULE, "IPI-resched");
cebf589c	186	#ifdef CONFIG_DEBUGGER
a84195f3	187	iic_request_ipi(PPC_MSG_DEBUGGER_BREAK, "IPI-debug");
cebf589c AB	188	#endif /* CONFIG_DEBUGGER */
cebf589c AB	189	}
0ebfff14	190
cebf589c AB	191	#endif /* CONFIG_SMP */
cebf589c AB	192
0ebfff14 BH	193
	194	static int iic_host_match(struct irq_host h, struct device_node node)
	195	{
	196	return h->host_data != NULL && node == h->host_data;
	197	}
	198
	199	static int iic_host_map(struct irq_host *h, unsigned int virq,
6e99e458	200	irq_hw_number_t hw)
0ebfff14 BH	201	{
	202	if (hw < IIC_IRQ_IPI0)
	203	set_irq_chip_and_handler(virq, &iic_chip, handle_fasteoi_irq);
	204	else
	205	set_irq_chip_and_handler(virq, &iic_chip, handle_percpu_irq);
	206	return 0;
	207	}
	208
	209	static int iic_host_xlate(struct irq_host h, struct device_node ct,
	210	u32 *intspec, unsigned int intsize,
	211	irq_hw_number_t out_hwirq, unsigned int out_flags)
	212
cebf589c	213	{
0ebfff14 BH	214	/* Currently, we don't translate anything. That needs to be fixed as
	215	* we get better defined device-trees. iic interrupts have to be
	216	* explicitely mapped by whoever needs them
	217	*/
	218	return -ENODEV;
	219	}
	220
	221	static struct irq_host_ops iic_host_ops = {
	222	.match = iic_host_match,
	223	.map = iic_host_map,
	224	.xlate = iic_host_xlate,
	225	};
	226
	227	static void __init init_one_iic(unsigned int hw_cpu, unsigned long addr,
	228	struct irq_host *host)
	229	{
	230	/* XXX FIXME: should locate the linux CPU number from the HW cpu
	231	* number properly. We are lucky for now
	232	*/
	233	struct iic *iic = &per_cpu(iic, hw_cpu);
cebf589c	234
0ebfff14 BH	235	iic->regs = ioremap(addr, sizeof(struct cbe_iic_thread_regs));
0ebfff14 BH	236	BUG_ON(iic->regs == NULL);
b9e5b4e6	237
0ebfff14 BH	238	iic->target_id = ((hw_cpu & 2) << 3) \| ((hw_cpu & 1) ? 0xf : 0xe);
	239	iic->eoi_stack[0] = 0xff;
	240	iic->host = host;
	241	out_be64(&iic->regs->prio, 0);
	242
	243	printk(KERN_INFO "IIC for CPU %d at %lx mapped to %p, target id 0x%x\n",
	244	hw_cpu, addr, iic->regs, iic->target_id);
	245	}
	246
	247	static int __init setup_iic(void)
	248	{
	249	struct device_node *dn;
	250	struct resource r0, r1;
	251	struct irq_host *host;
	252	int found = 0;
c61c27d5	253	const u32 *np;
0ebfff14 BH	254
	255	for (dn = NULL;
	256	(dn = of_find_node_by_name(dn,"interrupt-controller")) != NULL;) {
	257	if (!device_is_compatible(dn,
	258	"IBM,CBEA-Internal-Interrupt-Controller"))
	259	continue;
c61c27d5	260	np = get_property(dn, "ibm,interrupt-server-ranges", NULL);
0ebfff14 BH	261	if (np == NULL) {
	262	printk(KERN_WARNING "IIC: CPU association not found\n");
	263	of_node_put(dn);
	264	return -ENODEV;
cebf589c	265	}
0ebfff14 BH	266	if (of_address_to_resource(dn, 0, &r0) \|\|
	267	of_address_to_resource(dn, 1, &r1)) {
	268	printk(KERN_WARNING "IIC: Can't resolve addresses\n");
	269	of_node_put(dn);
	270	return -ENODEV;
	271	}
	272	host = NULL;
	273	if (found < IIC_NODE_COUNT) {
	274	host = irq_alloc_host(IRQ_HOST_MAP_LINEAR,
	275	IIC_SOURCE_COUNT,
	276	&iic_host_ops,
	277	IIC_IRQ_INVALID);
	278	iic_hosts[found] = host;
	279	BUG_ON(iic_hosts[found] == NULL);
	280	iic_hosts[found]->host_data = of_node_get(dn);
	281	found++;
	282	}
	283	init_one_iic(np[0], r0.start, host);
	284	init_one_iic(np[1], r1.start, host);
cebf589c	285	}
0ebfff14 BH	286
	287	if (found)
	288	return 0;
	289	else
	290	return -ENODEV;
cebf589c AB	291	}
cebf589c AB	292
b9e5b4e6	293	void __init iic_init_IRQ(void)
cebf589c	294	{
0ebfff14	295	/* Discover and initialize iics */
d0e57c68	296	if (setup_iic() < 0)
0ebfff14	297	panic("IIC: Failed to initialize !\n");
d0e57c68	298
0ebfff14 BH	299	/* Set master interrupt handling function */
0ebfff14 BH	300	ppc_md.get_irq = iic_get_irq;
b9e5b4e6	301
0ebfff14 BH	302	/* Enable on current CPU */
0ebfff14 BH	303	iic_setup_cpu();
cebf589c	304	}